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EP3452712B1 - Piston - Google Patents

Piston Download PDF

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Publication number
EP3452712B1
EP3452712B1 EP17720814.7A EP17720814A EP3452712B1 EP 3452712 B1 EP3452712 B1 EP 3452712B1 EP 17720814 A EP17720814 A EP 17720814A EP 3452712 B1 EP3452712 B1 EP 3452712B1
Authority
EP
European Patent Office
Prior art keywords
piston
recess
outer ring
inner ring
wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP17720814.7A
Other languages
German (de)
English (en)
Other versions
EP3452712A1 (fr
Inventor
Klaus Lormes
Willi Sikorsky
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KS Kolbenschmidt GmbH
Original Assignee
KS Kolbenschmidt GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by KS Kolbenschmidt GmbH filed Critical KS Kolbenschmidt GmbH
Publication of EP3452712A1 publication Critical patent/EP3452712A1/fr
Application granted granted Critical
Publication of EP3452712B1 publication Critical patent/EP3452712B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/0015—Multi-part pistons
    • F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/0015—Multi-part pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/16—Pistons  having cooling means
    • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/0015—Multi-part pistons
    • F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
    • F02F2003/0061—Multi-part pistons the parts being connected by casting, brazing, welding or clamping by welding

Definitions

  • the invention relates to a piston of an internal combustion engine, formed by an upper part joined to a lower part, wherein the lower part is formed by opposing connecting walls set back and inclined relative to the outer diameter of the piston, wherein each connecting wall has a pin bore and the respective end of each connecting wall merges into a piston skirt, according to the features of the preamble of patent claim 1.
  • Pistons in the so-called box design are well known and are used when the aim is to reduce the weight of the piston.
  • the connecting walls that connect the opposite piston skirts also known as load-bearing skirt wall sections
  • This inclination has been shown in practice to allow the combustion forces acting on the piston to be transmitted very well and to effectively limit the resulting deformation of the piston.
  • the separate production of a lower part and an upper part, which are joined together after their production is advantageous because certain elements of the piston are more easily accessible before assembly than would be the case after assembly.
  • a generic piston is from the DE 10 2005 041 001 A1 known.
  • the DE 10 2014 204 774 A1 describes a piston for an internal combustion engine.
  • the piston comprises at least a lower part and an upper part as well as a combustion chamber and at least one annular groove, wherein the upper part or the lower part is fixed with at least one undercut on the lower part or on the upper part and wherein the upper part comprises at least one combustion chamber and at least one annular groove.
  • the invention is based on the object of providing a piston of an internal combustion engine which is improved compared to generic pistons with regard to its manufacture, but in particular also with regard to which the weight is further reduced without the stability of the piston during operation in the cylinder of the internal combustion engine being restricted thereby.
  • the lower part has at least one recess facing the upper part and the upper part has at least one recess facing the lower part, the recesses overlapping after assembly, a permanent connection between the lower part and the upper part being a positive connection and the positive connection being formed by at least one spring and at least one groove that can be brought into operative connection therewith.
  • This at least one recess preferably several recesses per lower part and per upper part, enables local material savings to be made in order to reduce the weight of the piston after assembly.
  • the overlap of the two parts can be achieved with precise positioning by the form-fitting connection, so that a defined position of the upper part in relation to the lower part is always predefined either by the form-fitting connection (so that the two Parts no longer need to be moved relative to each other after they have been brought together) or a defined position can be set by relative movement of the two parts to each other.
  • the at least one recess in the lower part (and correspondingly also the recess in the upper part) is arranged above and outside the connecting wall.
  • the at least one local recess formed by joining the upper part and lower part is arranged below the upper part of the piston and is located outside the inner region of the piston, so that material can be saved in places where the piston is not subjected to high loads.
  • the invention does not provide for the at least one recess in the lower part (and thus also the corresponding at least one recess in the upper part) to be arranged above and within the two connecting walls.
  • This also makes it possible to save material on the piston in places that are arranged above the inner area, i.e. between the two connecting walls and the two opposing supporting skirt wall sections. This applies in particular if the piston does not have a combustion chamber bowl. Valve pockets that are flat can, but do not have to, be present.
  • a wall region of the connecting wall merges seamlessly into a wall region of the at least one recess of the lower part. If the at least one recess in the lower part (and also in the upper part) is arranged above the connecting wall, it is advantageous that a transition from the wall region of the connecting wall into the wall region of the at least one local recess merges seamlessly, so that here too, sharp-edged transitions, step-like transitions or the like are avoided in order to counteract the formation of cracks.
  • This seamless transition can, but does not have to, be located in the area of a joining plane between the upper and lower parts. It can also be easily implemented using the positive connection (tongue and groove principle).
  • a recess in the lower part is arranged above the bolt bore and one recess in the lower part is arranged above and next to the bolt bore.
  • Figure 1 shows a piston 1 that is not yet ready for operation and is formed by a lower part 2 and an upper part 3. These two parts 2, 3 are manufactured separately from one another in a suitable manner (identical or different materials, identical or different manufacturing processes and the like). 4 indicates Figure 1 a bolt hole.
  • Figure 2 shows the upper part 3 in a plan view from below, whereby the plane shown faces the lower part 2 when these two parts 2, 3 are joined together
  • the upper part 3 has at least one local recess, here three local recesses 5 symmetrical to a transverse axis of the upper part 3.
  • the position and number of recesses 5 is exemplary and can vary in terms of position and/or number.
  • FIG 3 shows the lower part 2, which comprises a piston shaft 6, opposite which lies a further piston shaft (not shown).
  • This piston shaft 6 is designed as a supporting shaft wall section and is connected by two approximately parallel and inclined connecting walls (inclined in relation to the piston stroke axis).
  • an outer ring 8 can be present, for example, from which at least one web, here several webs 9, extend in the direction of the center of the piston. These webs 9 can start from the outer ring 8, in the same plane or in a plane offset therefrom.
  • an inner ring 10 is present concentrically within the outer ring 8, the outer ring 8 being arranged in a different plane than the inner ring 10 and possibly the webs 9.
  • a central region 11 is present, which in this case is also arranged in a different plane than the planes in which the outer ring 8, webs 9 and inner ring 10 are located. This creates a groove or a space between the outer ring 8 and the inner ring 10 and/or the inner ring 10 and the central region 11. two grooves are formed in the lower part 2 to form part of the positive connection.
  • the reference number 12 designates at least one recess in the lower part 2, which can in principle be provided at a suitable location in order to save material.
  • a recess 12 is present within the central region 11 and extending in the direction of the piston skirts 6, which is thus located above a central region of the lower part 2.
  • a recess 12 (or two recesses 12 symmetrical to a transverse axis of the lower part 2) which is arranged above the pin bore 4.
  • this recess 12 arranged above the pin bore 4 there is a recess 12 to the right and left of and above the pin bore 4.
  • the outer ring 8 of the lower part 2 corresponds to an outer ring 13 ( Figure 2 ) of the upper part 3.
  • the respective web 9 of the lower part 2 corresponds to the associated webs 14 ( Figure 2 ) of the upper part 3.
  • the inner ring 10 also corresponds to an inner ring 15 ( Figure 2 ) of the upper part 3.
  • the mutually facing support surfaces and the respective local recesses are preferably symmetrical and overlapping in order to save weight.
  • the same can also apply to the central area 11, but does not have to, as the Figure 2 can be removed.
  • the wall area of the recesses 12 arranged above and next to the bolt hole merges seamlessly into the wall area of the connecting wall.
  • the recess 12 of the lower part 2 merges into the corresponding recess 5 of the upper part 3.
  • the recesses 5/12 which overlap, also have no transition after joining.
  • Figure 4 shows a ready-to-use piston 1, in which the lower part 2 and the upper part 3 have been permanently joined together in a suitable manner. Also visible are the opposing piston shafts 6 and the connecting walls 7 connecting the piston shafts 6, in which the pin bore 4 is arranged.
  • Figure 5 shows the piston according to Figure 4 in a view from below.
  • the horizontal and vertical course of the connecting walls 7 can be seen, which also include the pin bosses surrounding the pin bore 4.
  • This outward-facing course as well as the course or shape of the connecting walls 7 facing the interior of the piston 1 is particularly important, since it allows the local recesses to be made in the two Support parts 2, 3 and at the same time optimally support the piston crown (formed by the upper part 3).
  • This form-fitting connection is formed as in Figure 7 is shown, by at least one spring 16 and at least one groove 17 that can be brought into operative connection therewith.
  • the spring 16 can be arranged, for example, on the upper part 13 and the groove 17 on the lower part 2 (and/or vice versa).
  • this system is as in Figure 6 shown is present several times.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Claims (7)

  1. Piston (1) d'un moteur à combustion interne, formé par une partie supérieure (3) reliée à une partie inférieure (2), dans lequel la partie inférieure (2) est formée par des parois de liaison opposées (7) qui sont en retrait et inclinées par rapport au diamètre extérieur du piston (1), dans lequel, dans chaque cas, une paroi de liaison (7) comporte un alésage d'axe (4) et l'extrémité respective de chaque paroi de liaison (7) fusionne en une jupe de piston (6), dans lequel la partie inférieure (2) comporte au moins un évidement (12) faisant face dans la direction de la partie supérieure (3) et la partie supérieure (3) comporte au moins un évidement (5) faisant face dans la direction de la partie inférieure (2), dans lequel les évidements (5, 12) se superposent après une liaison, dans lequel, en outre, une liaison permanente entre la partie inférieure (2) et la partie supérieure (3) est une liaison positive et la liaison positive est formée par au moins une languette (16) et au moins une rainure (17) qui peut être amenée en liaison fonctionnelle avec cette dernière, et dans lequel l'au moins un évidement (12) de la partie inférieure (2) est disposé au-dessus et à l'extérieur de la paroi de liaison (7).
  2. Piston (1) selon la revendication 1, caractérisé en ce qu'une région de paroi de la paroi de liaison (7) fusionne de manière continue en une région de paroi de l'au moins un évidement (12) de la partie inférieure (2).
  3. Piston (1) selon l'une des revendications précédentes, caractérisé en ce qu'un évidement (12) de la partie inférieure (2) est disposé au-dessus de l'alésage d'axe (4) et, dans chaque cas, un évidement (12) de la partie inférieure (2) est disposé au-dessus à proximité de l'alésage d'axe (4).
  4. Piston (1) selon l'une des revendications précédentes, caractérisé en ce qu'un évidement (12) de la partie inférieure (2) est entouré par au moins une âme (9) qui, en partant d'une bague extérieure (8) de la partie inférieure (2), s'étend dans la direction d'une région centrale (11) du piston (1).
  5. Piston (1) selon la revendication 4, caractérisé en ce que l'au moins une bague intérieure (10) disposée décalée de la bague extérieure (8) est disposée coaxialement à cette dernière.
  6. Piston (1) selon l'une des revendications précédentes, caractérisé en ce que la bague extérieure (8) et la région circonférentielle s'étendant parallèlement à cette dernière au niveau de l'extrémité faisant face vers l'extérieur des âmes (9) et/ou la bague intérieure (10) et la région centrale (11) sont disposées dans un seul et même plan.
  7. Piston (1) selon l'une des revendications précédentes, caractérisé en ce que la bague extérieure (8) et la région circonférentielle s'étendant parallèlement à cette dernière au niveau de l'extrémité faisant face vers l'extérieur des âmes (9) et/ou la bague intérieure (10) et la région centrale (11) sont disposées dans au moins deux plans différents.
EP17720814.7A 2016-05-04 2017-05-03 Piston Active EP3452712B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016108271 2016-05-04
PCT/EP2017/060534 WO2017191189A1 (fr) 2016-05-04 2017-05-03 Piston

Publications (2)

Publication Number Publication Date
EP3452712A1 EP3452712A1 (fr) 2019-03-13
EP3452712B1 true EP3452712B1 (fr) 2024-11-20

Family

ID=58664721

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17720814.7A Active EP3452712B1 (fr) 2016-05-04 2017-05-03 Piston

Country Status (7)

Country Link
US (1) US11162453B2 (fr)
EP (1) EP3452712B1 (fr)
CN (1) CN109312688A (fr)
DE (1) DE102017109471A1 (fr)
MX (1) MX2018013353A (fr)
PL (1) PL3452712T3 (fr)
WO (1) WO2017191189A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021013788A1 (fr) 2019-07-19 2021-01-28 Ks Kolbenschmidt Gmbh Piston pour un moteur à combustion interne, avec réduction de la puissance de frottement

Citations (2)

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DE102017109471A1 (de) 2017-11-09
US20190145344A1 (en) 2019-05-16
EP3452712A1 (fr) 2019-03-13
CN109312688A (zh) 2019-02-05
WO2017191189A1 (fr) 2017-11-09
US11162453B2 (en) 2021-11-02
MX2018013353A (es) 2019-02-20

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